https://trac.ffmpeg.org/ticket/986 appears to be the "canonical" named pipe page, besides that I've never tried it, sorry.
On 5/3/16, Robin Stevens <[email protected]> wrote: > I tried pipes in different formats/syntaxis. > > Previously I used the multipurpose-encoder from Datastead to setup a > rtsp-stream. After some tests it became clear that this software is piping > video into ffmpeg. So I looked at the console log of ffmpeg from the > multipurpose-encoder and there was listed that ffmpeg gets his stream from > "\\.\pipe\7EB76D4B9CD3464C93908CCB9E3CE1CF". > > So I closed the ffmpeg executable that was executed from the > multipurpose-encoder and tried to connect with the same build/executable to > that pipe. The only thing I get was the error message "Invalid argument". > Then I tried to instantiate my own named pipe in windows with the same > syntax as Datastead is doing that. Like "\\.\pipe\tmp_pipe1". > > When I tried to open the pipe with ffplay I get the following message: > "pipe:\\.\pipe\tmp_pipe1: Cannot allocate memory" > > When I tried to open the pipe with ffmpeg I get the following message: > "[IMGUTILS @ 005af780] Picture size 0x0 is invalid > pipe:\\.\pipe\tmp_pipe1: Invalid argument" > > When I try to write to the pipe with ffmpeg, it prints the console with a > bunch of data and after a few seconds it isn't responding anymore. > > I know the "pipe" protocol is compiled with this version of ffmpeg and while > the software of Datastead is executing ffmpeg with a named pipe as input > parameter it seems that is has to work. > > Do I need a different kind of pipe here? Or do have to add protocol > parameters to write to this pipe? Does anyone experience with named pipes? > > Kind regards, > > Robin > > -----Oorspronkelijk bericht----- > Van: ffmpeg-user [mailto:[email protected]] Namens Roger Pack > Verzonden: dinsdag 3 mei 2016 3:43 > Aan: FFmpeg user questions <[email protected]> > Onderwerp: Re: [FFmpeg-user] named pipes ffmpeg > > On 4/29/16, Robin Stevens <[email protected]> wrote: >> I am having trouble to get ffmpeg write to a named pipe in windows. I >> know it's possible to write to a anonymous pipe with the command: >> >> ffmpeg.exe -vsync passthrough -f dshow -i video="AVerMedia SD 1 >> Capture":audio="AVerMedia SD Audio Cap 1 (AVerM" -vcodec rawvideo -f >> matroska - >> >> And I can read the pipe with ffplay.exe -i - >> >> But is it possible to write to a named pipe? >> >> I tried to by creating a named pipe with the following c# code: >> >> NamedPipeServerStream p_from_ffmpeg = new >> NamedPipeServerStream("tmp_pipe1", >> PipeDirection.In, >> 1, >> PipeTransmissionMode.Byte, >> PipeOptions.WriteThrough, >> 1000, 1000); >> >> I checked if the pipe really exist with the pipelist.exe from >> https://technet.microsoft.com/en-us/sysinternals/dd581625.aspx. >> >> Then I tried to write the output data from ffmpeg to the pipe by using >> the following command: >> >> ffmpeg.exe -vsync passthrough -f dshow -i video="AVerMedia SD 1 >> Capture":audio="AVerMedia SD Audio Cap 1 (AVerM" -vcodec rawvideo -f >> matroska tmp_pipe1 >> >> and the following: >> >> ffmpeg.exe -vsync passthrough -f dshow -i video="AVerMedia SD 1 >> Capture":audio="AVerMedia SD Audio Cap 1 (AVerM" -vcodec rawvideo -f >> matroska pipe:1 > tmp_pipe1 >> >> Both commands are adding a file named "tmp_pipe1" to the directory of >> the ffmpeg executable while the anonymous pipe isn't adding a file and >> is working perfectly for me. The only problem is that I would like to >> deinterlace, record with a codec and render/view more than one >> channel. So I thought to run one instance of ffmpeg and pipe the >> outputs to multiple instances of ffplay. I don't know whether it's >> possible to write the output of ffmpeg to a named pipe in windows. Does >> someone has an answer? > > I think you have to name it something like \\pipe_name or some odd... > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email [email protected] > with subject "unsubscribe". > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
